服务器网络中转，端口转发脚本使用教程

服务器网络中转，端口转发脚本使用教程

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wget -N --no-check-certificate https://raw.githubusercontent.com/ToyoDAdoubiBackup/doubi/master/iptables-pf.sh && chmod +x iptables-pf.sh && bash iptables-pf.sh

一下是配置过程的步骤

请输入 iptables 欲转发至的 远程端口 [1-65535] (支持端口段 如 2333-6666, 被转发服务器):

比如输入：10000-11000

欲转发端口 : 10000-11000

请输入 iptables 欲转发至的 远程IP(被转发服务器):

比如输入：223.3.3.3

欲转发服务器IP : 223.3.3.3

请输入 iptables 本地监听端口 [1-65535] (支持端口段 如 2333-6666)

(默认端口: 10000-11000):

比如输入：10000-11000

本地监听端口 : 10000-11000

请输入 本服务器的 公网IP网卡IP(注意是网卡绑定的IP，而不仅仅是公网IP，回车自动检测):

本服务器IP : 1.1.1.1

比如输入：1.1.1.1

请输入数字 来选择 iptables 转发类型:

1. TCP

2. UDP

3. TCP+UDP

(默认: TCP+UDP):

比如输入：3

请检查 iptables 端口转发规则配置是否有误 !

本地监听端口 : 10000-11000

服务器 IP : 223.3.3.3

欲转发的端口 : 10000-11000

欲转发 IP : 1.1.1.1

转发类型 : TCP+UDP

脚本内容备份（防止哪天上面链接里的脚本被删）：

#!/usr/bin/env bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

#=================================================
#	System Required: CentOS/Debian/Ubuntu
#	Description: iptables Port forwarding
#	Version: 1.1.1
#	Author: Toyo
#=================================================
sh_ver="1.1.1"

Green_font_prefix="\033[32m" && Red_font_prefix="\033[31m" && Green_background_prefix="\033[42;37m" && Red_background_prefix="\033[41;37m" && Font_color_suffix="\033[0m"
Info="${Green_font_prefix}[信息]${Font_color_suffix}"
Error="${Red_font_prefix}[错误]${Font_color_suffix}"
Tip="${Green_font_prefix}[注意]${Font_color_suffix}"

check_iptables(){
  iptables_exist=$(iptables -V)
  [[ ${iptables_exist} = "" ]] && echo -e "${Error} 没有安装iptables，请检查 !" && exit 1
}
check_sys(){
  if [[ -f /etc/redhat-release ]]; then
    release="centos"
  elif cat /etc/issue | grep -q -E -i "debian"; then
    release="debian"
  elif cat /etc/issue | grep -q -E -i "ubuntu"; then
    release="ubuntu"
  elif cat /etc/issue | grep -q -E -i "centos|red hat|redhat"; then
    release="centos"
  elif cat /proc/version | grep -q -E -i "debian"; then
    release="debian"
  elif cat /proc/version | grep -q -E -i "ubuntu"; then
    release="ubuntu"
  elif cat /proc/version | grep -q -E -i "centos|red hat|redhat"; then
    release="centos"
    fi
  #bit=`uname -m`
}
install_iptables(){
  iptables_exist=$(iptables -V)
  if [[ ${iptables_exist} != "" ]]; then
    echo -e "${Info} 已经安装iptables，继续..."
  else
    echo -e "${Info} 检测到未安装 iptables，开始安装..."
    if [[ ${release}  == "centos" ]]; then
      yum update
      yum install -y iptables
    else
      apt-get update
      apt-get install -y iptables
    fi
    iptables_exist=$(iptables -V)
    if [[ ${iptables_exist} = "" ]]; then
      echo -e "${Error} 安装iptables失败，请检查 !" && exit 1
    else
      echo -e "${Info} iptables 安装完成 !"
    fi
  fi
  echo -e "${Info} 开始配置 iptables !"
  Set_iptables
  echo -e "${Info} iptables 配置完毕 !"
}
Set_forwarding_port(){
  read -e -p "请输入 iptables 欲转发至的 远程端口 [1-65535] (支持端口段 如 2333-6666, 被转发服务器):" forwarding_port
  [[ -z "${forwarding_port}" ]] && echo "取消..." && exit 1
  echo && echo -e "	欲转发端口 : ${Red_font_prefix}${forwarding_port}${Font_color_suffix}" && echo
}
Set_forwarding_ip(){
    read -e -p "请输入 iptables 欲转发至的 远程IP(被转发服务器):" forwarding_ip
    [[ -z "${forwarding_ip}" ]] && echo "取消..." && exit 1
    echo && echo -e "	欲转发服务器IP : ${Red_font_prefix}${forwarding_ip}${Font_color_suffix}" && echo
}
Set_local_port(){
  echo -e "请输入 iptables 本地监听端口 [1-65535] (支持端口段 如 2333-6666)"
  read -e -p "(默认端口: ${forwarding_port}):" local_port
  [[ -z "${local_port}" ]] && local_port="${forwarding_port}"
  echo && echo -e "	本地监听端口 : ${Red_font_prefix}${local_port}${Font_color_suffix}" && echo
}
Set_local_ip(){
  read -e -p "请输入 本服务器的 网卡IP(注意是网卡绑定的IP，而不仅仅是公网IP，回车自动检测外网IP):" local_ip
  if [[ -z "${local_ip}" ]]; then
    local_ip=$(wget -qO- -t1 -T2 ipinfo.io/ip)
    if [[ -z "${local_ip}" ]]; then
      echo "${Error} 无法检测到本服务器的公网IP，请手动输入"
      read -e -p "请输入 本服务器的 网卡IP(注意是网卡绑定的IP，而不仅仅是公网IP):" local_ip
      [[ -z "${local_ip}" ]] && echo "取消..." && exit 1
    fi
  fi
  echo && echo -e "	本服务器IP : ${Red_font_prefix}${local_ip}${Font_color_suffix}" && echo
}
Set_forwarding_type(){
  echo -e "请输入数字 来选择 iptables 转发类型:
 1. TCP
 2. UDP
 3. TCP+UDP\n"
  read -e -p "(默认: TCP+UDP):" forwarding_type_num
  [[ -z "${forwarding_type_num}" ]] && forwarding_type_num="3"
  if [[ ${forwarding_type_num} == "1" ]]; then
    forwarding_type="TCP"
  elif [[ ${forwarding_type_num} == "2" ]]; then
    forwarding_type="UDP"
  elif [[ ${forwarding_type_num} == "3" ]]; then
    forwarding_type="TCP+UDP"
  else
    forwarding_type="TCP+UDP"
  fi
}
Set_Config(){
  Set_forwarding_port
  Set_forwarding_ip
  Set_local_port
  Set_local_ip
  Set_forwarding_type
  echo && echo -e "——————————————————————————————
  请检查 iptables 端口转发规则配置是否有误 !\n
  本地监听端口    : ${Green_font_prefix}${local_port}${Font_color_suffix}
  服务器 IP\t: ${Green_font_prefix}${local_ip}${Font_color_suffix}\n
  欲转发的端口    : ${Green_font_prefix}${forwarding_port}${Font_color_suffix}
  欲转发 IP\t: ${Green_font_prefix}${forwarding_ip}${Font_color_suffix}
  转发类型\t: ${Green_font_prefix}${forwarding_type}${Font_color_suffix}
——————————————————————————————\n"
  read -e -p "请按任意键继续，如有配置错误请使用 Ctrl+C 退出。" var
}
Add_forwarding(){
  check_iptables
  Set_Config
  local_port=$(echo ${local_port} | sed 's/-/:/g')
  forwarding_port_1=$(echo ${forwarding_port} | sed 's/-/:/g')
  if [[ ${forwarding_type} == "TCP" ]]; then
    Add_iptables "tcp"
  elif [[ ${forwarding_type} == "UDP" ]]; then
    Add_iptables "udp"
  elif [[ ${forwarding_type} == "TCP+UDP" ]]; then
    Add_iptables "tcp"
    Add_iptables "udp"
  fi
  Save_iptables
  clear && echo && echo -e "——————————————————————————————
  iptables 端口转发规则配置完成 !\n
  本地监听端口    : ${Green_font_prefix}${local_port}${Font_color_suffix}
  服务器 IP\t: ${Green_font_prefix}${local_ip}${Font_color_suffix}\n
  欲转发的端口    : ${Green_font_prefix}${forwarding_port_1}${Font_color_suffix}
  欲转发 IP\t: ${Green_font_prefix}${forwarding_ip}${Font_color_suffix}
  转发类型\t: ${Green_font_prefix}${forwarding_type}${Font_color_suffix}
——————————————————————————————\n"
}
View_forwarding(){
  check_iptables
  forwarding_text=$(iptables -t nat -vnL PREROUTING|tail -n +3)
  [[ -z ${forwarding_text} ]] && echo -e "${Error} 没有发现 iptables 端口转发规则，请检查 !" && exit 1
  forwarding_total=$(echo -e "${forwarding_text}"|wc -l)
  forwarding_list_all=""
  for((integer = 1; integer <= ${forwarding_total}; integer++))
  do
    forwarding_type=$(echo -e "${forwarding_text}"|awk '{print $4}'|sed -n "${integer}p")
    forwarding_listen=$(echo -e "${forwarding_text}"|awk '{print $11}'|sed -n "${integer}p"|awk -F "dpt:" '{print $2}')
    [[ -z ${forwarding_listen} ]] && forwarding_listen=$(echo -e "${forwarding_text}"| awk '{print $11}'|sed -n "${integer}p"|awk -F "dpts:" '{print $2}')
    forwarding_fork=$(echo -e "${forwarding_text}"| awk '{print $12}'|sed -n "${integer}p"|awk -F "to:" '{print $2}')
    forwarding_list_all=${forwarding_list_all}"${Green_font_prefix}"${integer}".${Font_color_suffix} 类型: ${Green_font_prefix}"${forwarding_type}"${Font_color_suffix} 监听端口: ${Red_font_prefix}"${forwarding_listen}"${Font_color_suffix} 转发IP和端口: ${Red_font_prefix}"${forwarding_fork}"${Font_color_suffix}\n"
  done
  echo && echo -e "当前有 ${Green_background_prefix} "${forwarding_total}" ${Font_color_suffix} 个 iptables 端口转发规则。"
  echo -e ${forwarding_list_all}
}
Del_forwarding(){
  check_iptables
  while true
  do
  View_forwarding
  read -e -p "请输入数字 来选择要删除的 iptables 端口转发规则(默认回车取消):" Del_forwarding_num
  [[ -z "${Del_forwarding_num}" ]] && Del_forwarding_num="0"
  echo $((${Del_forwarding_num}+0)) &>/dev/null
  if [[ $? -eq 0 ]]; then
    if [[ ${Del_forwarding_num} -ge 1 ]] && [[ ${Del_forwarding_num} -le ${forwarding_total} ]]; then
      forwarding_type=$(echo -e "${forwarding_text}"| awk '{print $4}' | sed -n "${Del_forwarding_num}p")
      forwarding_listen=$(echo -e "${forwarding_text}"| awk '{print $11}' | sed -n "${Del_forwarding_num}p" | awk -F "dpt:" '{print $2}' | sed 's/-/:/g')
      [[ -z ${forwarding_listen} ]] && forwarding_listen=$(echo -e "${forwarding_text}"| awk '{print $11}' |sed -n "${Del_forwarding_num}p" | awk -F "dpts:" '{print $2}')
      Del_iptables "${forwarding_type}" "${Del_forwarding_num}"
      Save_iptables
      echo && echo -e "${Info} iptables 端口转发规则删除完成 !" && echo
    else
      echo -e "${Error} 请输入正确的数字 !"
    fi
  else
    break && echo "取消..."
  fi
  done
}
Uninstall_forwarding(){
  check_iptables
  echo -e "确定要清空 iptables 所有端口转发规则 ? [y/N]"
  read -e -p "(默认: n):" unyn
  [[ -z ${unyn} ]] && unyn="n"
  if [[ ${unyn} == [Yy] ]]; then
    forwarding_text=$(iptables -t nat -vnL PREROUTING|tail -n +3)
    [[ -z ${forwarding_text} ]] && echo -e "${Error} 没有发现 iptables 端口转发规则，请检查 !" && exit 1
    forwarding_total=$(echo -e "${forwarding_text}"|wc -l)
    for((integer = 1; integer <= ${forwarding_total}; integer++))
    do
      forwarding_type=$(echo -e "${forwarding_text}"|awk '{print $4}'|sed -n "${integer}p")
      forwarding_listen=$(echo -e "${forwarding_text}"|awk '{print $11}'|sed -n "${integer}p"|awk -F "dpt:" '{print $2}')
      [[ -z ${forwarding_listen} ]] && forwarding_listen=$(echo -e "${forwarding_text}"| awk '{print $11}'|sed -n "${integer}p"|awk -F "dpts:" '{print $2}')
      # echo -e "${forwarding_text} ${forwarding_type} ${forwarding_listen}"
      Del_iptables "${forwarding_type}" "${integer}"
    done
    Save_iptables
    echo && echo -e "${Info} iptables 已清空 所有端口转发规则 !" && echo
  else
    echo && echo "清空已取消..." && echo
  fi
}
Add_iptables(){
  iptables -t nat -A PREROUTING -p "$1" --dport "${local_port}" -j DNAT --to-destination "${forwarding_ip}":"${forwarding_port}"
  iptables -t nat -A POSTROUTING -p "$1" -d "${forwarding_ip}" --dport "${forwarding_port_1}" -j SNAT --to-source "${local_ip}"
  echo "iptables -t nat -A PREROUTING -p $1 --dport ${local_port} -j DNAT --to-destination ${forwarding_ip}:${forwarding_port}"
  echo "iptables -t nat -A POSTROUTING -p $1 -d ${forwarding_ip} --dport ${forwarding_port_1} -j SNAT --to-source ${local_ip}"
  echo "${local_port}"
  iptables -I INPUT -m state --state NEW -m "$1" -p "$1" --dport "${local_port}" -j ACCEPT
}
Del_iptables(){
  iptables -t nat -D POSTROUTING "$2"
  iptables -t nat -D PREROUTING "$2"
  iptables -D INPUT -m state --state NEW -m "$1" -p "$1" --dport "${forwarding_listen}" -j ACCEPT
}
Save_iptables(){
  if [[ ${release} == "centos" ]]; then
    service iptables save
  else
    iptables-save > /etc/iptables.up.rules
  fi
}
Set_iptables(){
  echo -e "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
  sysctl -p
  if [[ ${release} == "centos" ]]; then
    service iptables save
    chkconfig --level 2345 iptables on
  else
    iptables-save > /etc/iptables.up.rules
    echo -e '#!/bin/bash\n/sbin/iptables-restore < /etc/iptables.up.rules' > /etc/network/if-pre-up.d/iptables
    chmod +x /etc/network/if-pre-up.d/iptables
  fi
}
Update_Shell(){
  sh_new_ver=$(wget --no-check-certificate -qO- -t1 -T3 "https://raw.githubusercontent.com/ToyoDAdoubiBackup/doubi/master/iptables-pf.sh"|grep 'sh_ver="'|awk -F "=" '{print $NF}'|sed 's/\"//g'|head -1)
  [[ -z ${sh_new_ver} ]] && echo -e "${Error} 无法链接到 Github !" && exit 0
  wget -N --no-check-certificate "https://raw.githubusercontent.com/ToyoDAdoubiBackup/doubi/master/iptables-pf.sh" && chmod +x iptables-pf.sh
  echo -e "脚本已更新为最新版本[ ${sh_new_ver} ] !(注意：因为更新方式为直接覆盖当前运行的脚本，所以可能下面会提示一些报错，无视即可)" && exit 0
}
check_sys
echo && echo -e " iptables 端口转发一键管理脚本 ${Red_font_prefix}[v${sh_ver}]${Font_color_suffix}
  -- Toyo | doub.io/wlzy-20 --
  
 ${Green_font_prefix}0.${Font_color_suffix} 升级脚本
————————————
 ${Green_font_prefix}1.${Font_color_suffix} 安装 iptables
 ${Green_font_prefix}2.${Font_color_suffix} 清空 iptables 端口转发
————————————
 ${Green_font_prefix}3.${Font_color_suffix} 查看 iptables 端口转发
 ${Green_font_prefix}4.${Font_color_suffix} 添加 iptables 端口转发
 ${Green_font_prefix}5.${Font_color_suffix} 删除 iptables 端口转发
————————————
注意：初次使用前请请务必执行 ${Green_font_prefix}1. 安装 iptables${Font_color_suffix}(不仅仅是安装)" && echo
read -e -p " 请输入数字 [0-5]:" num
case "$num" in
  0)
  Update_Shell
  ;;
  1)
  install_iptables
  ;;
  2)
  Uninstall_forwarding
  ;;
  3)
  View_forwarding
  ;;
  4)
  Add_forwarding
  ;;
  5)
  Del_forwarding
  ;;
  *)
  echo "请输入正确数字 [0-5]"
  ;;
esac